A radiofrequency ablation catheter with a mechanical support system

Abstract

The present invention provides a radiofrequency ablation catheter with a mechanical support system, which includes a handle cover, an electrode needle control device, and a mechanical support device. The mechanical support device and the electrode needle control device are installed in the handle cover. The mechanical support system includes an introduction hose, an elastic bracket, a bracket fixing block, a flexible steel wire, and a stud connected in sequence. The elastic bracket is arched in shape under its own elastic recovery and the tension of a tension spring, which can play a supporting and positioning role, has a simple structure, and is easy to use. Using a mechanical support device instead of a balloon support device can avoid medical risks caused by balloon leakage or rupture, and can greatly reduce costs.

Description

Technical Field

[0001] The present invention relates to the field of radiofrequency ablation catheters, and in particular to a radiofrequency ablation catheter with a mechanical support system. Background Art

[0002] As a type of thermal ablation, radiofrequency technology has become a trend in the industry with the development of minimally invasive ablation. Gastroesophageal reflux is a common chronic upper gastrointestinal motility disorder, which is caused by pathological changes such as excessive relaxation of the lower esophageal sphincter, hiatal hernia and relaxation of the esophagogastric junction, either alone or together. Radiofrequency ablation technology has developed rapidly in the treatment of gastroesophageal reflux disease due to its advantages of minimal invasiveness and good efficacy.

[0003] Radiofrequency ablation catheter is a device that implements radiofrequency ablation technology. When performing radiofrequency treatment, it is necessary to support and position the treatment site first, and then send out radiofrequency needles to penetrate the human tissue at the treatment site to perform radiofrequency ablation treatment. The current support system uses a balloon support for the support and positioning of the radiofrequency ablation catheter.

[0004] However, there are two main problems with the balloon support method. On the one hand, the manufacturing process of the balloon is still relatively complicated and the cost of balloon production is very high. On the other hand, the balloon needs to be inflated during balloon support. Balloons that do not meet the airtightness requirements will leak or burst due to the air pressure.

[0005] The present invention adopts a mechanical support positioning method to replace the support method using a balloon. Summary of the invention

[0006] The present invention provides a radiofrequency ablation catheter with a mechanical support system, which uses a mechanical support positioning device to replace a balloon support positioning method.

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is implemented as follows:

[0008] A radiofrequency ablation catheter with a mechanical support system includes a handle cover, an electrode needle control device, and a mechanical support device. It is characterized in that the mechanical support device and the electrode needle control device are installed in the handle cover, and the mechanical support system includes an introduction hose, an elastic bracket, a bracket fixing block, a flexible steel wire, and a stud connected in sequence.

[0009] Furthermore, the mechanical support device also includes a tension spring, a bracket guide block, and an outer tube. The elastic bracket passes through the bracket guide block, and the bracket guide block is fixedly connected to one end of the outer tube. The tension spring, the bracket fixing block, and the flexible steel wire pass through the outer tube. The other end of the outer tube is connected to the handle cover. The tension spring is connected between the bracket guide block and the bracket fixing block, and the bracket fixing block can move inside the outer tube.

[0010] Furthermore, the mechanical support device also includes a limit pin and a nut seat, the nut seat is fixed in the handle cover, the stud is connected to the nut seat, the stud includes a limit boss and a pin assembly screw hole, and the limit pin is installed in the pin assembly screw hole.

[0011] Furthermore, the electrode needle control device includes an electrode needle connecting rod, an electrode needle, a rack, a gear connecting rod, and a push rod. The elastic bracket is provided with an electrode needle guide hole. One end of the electrode needle is fixedly connected to the electrode needle fixing block, and the other end of the electrode needle is installed in the electrode needle guide hole. The push rod is guided and connected to the connecting rod portion of the gear connecting rod. The gear portion of the gear connecting rod forms a gear and rack connection with the rack. The gear connecting rod is installed in the handle cover. One end of the electrode needle connecting rod is fixedly connected to the rack, and the other end is fixedly connected to the electrode needle fixing block. The flexible steel wire passes through the electrode needle fixing block.

[0012] Furthermore, it is characterized in that the elastic bracket is made of elastic material and is arched in a natural state.

[0013] Working principle: Before the radiofrequency ablation catheter reaches the treatment site, the stud pulls the bracket fixing block through the flexible steel wire. At this time, the elastic bracket is in an elastic deformation state, and the arched state is straightened into a straight state. When support and positioning are required, the stud is rotated to move toward the electrode needle. At this time, the elastic bracket recovers to an arched state under the action of its own restoring elastic force and the tension of the tension spring, thereby playing a supporting and positioning role; the electrode needle installed in the elastic bracket pushes the push handle through the electrode needle fixing block, the electrode needle connecting rod, the rack, and the gear connecting rod to complete the electrode needle withdrawal / retraction.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The elastic bracket is in an arched shape under its own restoring elastic force and the tension of the tension spring, which can play a supporting and positioning role, with a simple structure and easy use;

[0016] (2) Using a mechanical support device instead of a balloon support device can avoid the medical risks caused by balloon leakage or rupture, and can greatly reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the general assembly drawing of the radiofrequency ablation catheter with mechanical support system.

[0018] Figure 2 It is an enlarged schematic diagram of the tightened state of the elastic bracket of part I in the general assembly diagram.

[0019] Figure 3 It is an enlarged schematic diagram of the open state of the elastic support of part I in the general assembly diagram.

[0020] Figure 4 It is a schematic diagram of the internal installation of the radiofrequency ablation catheter handle cover.

[0021] Figure 5 is a schematic diagram of the stud.

[0022] Figure 6 is a schematic diagram of an elastic bracket.

[0023] Description of main component symbols:

[0024] 1-mechanical support device; 2-electrode needle control device; 3-handle cover; 11-introduction hose; 12-elastic bracket; 12-1-electrode needle guide hole; 13-bracket guide block; 14-tension spring; 15-bracket fixing block; 16-flexible steel wire; 17-stud; 17-1-limiting boss; 17-2-pin assembly screw hole; 18-nut seat; 19-outer tube; 21-electrode needle; 22-electrode needle fixing block; 23-electrode needle connecting rod; 24-rack; 25-gear connecting rod; 26-push rod.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. DETAILED DESCRIPTION

[0026] Example 1

[0027] A radiofrequency ablation catheter with a mechanical support system comprises a mechanical support device 1, an electrode needle control device 2 and a handle cover 3. The mechanical support device 1 and the electrode needle control device 2 are installed inside one side of the handle cover 3.

[0028] The mechanical support device 1 includes an introduction hose 11 and an elastic bracket 12. The elastic bracket 12 is provided with an electrode needle guide hole 12-1. The introduction hose 11 is fixedly connected to the elastic bracket 12. The mechanical device 1 also includes a bracket guide block 13, a tension spring 14, a bracket fixing seat 15, a flexible steel wire 16, a stud 17, a nut seat 18, and an outer tube 19. The bracket guide block 13 is connected to the outer tube 19. The bracket guide block 13, the tension spring 14, the bracket fixing seat 15, and the flexible steel wire 16 pass through the outer tube 19. The bracket fixing block 15 can move in the outer tube 19, the flexible steel wire 16 is fixedly installed on the stud 17, a limiting boss 17-2 and a pin assembly screw hole 17-2 are set on the stud 17, a pin is installed in the pin assembly screw hole 17-2, the stud 17 is limited by the setting of the limiting boss 17-1, the pin and the pin assembly screw hole 17-2, the stud 17 is installed on the nut seat 18, the nut seat 18 is fixed on the handle cover 3, the pin assembly screw hole 17-2 and the limiting boss 17-1 are located at both ends of the stud 19.

[0029] When the radiofrequency ablation catheter is not in use, the stud 19 pulls the bracket fixing block 15 through the flexible steel wire 16. At this time, the elastic bracket 12 is in a straight state. When the catheter reaches the predetermined position, the stud 19 is screwed in, and the flexible steel wire 16 pushes the bracket fixing seat 15, further pushing the tension spring 14 and the elastic bracket 12. The elastic bracket 12 is in an arched state under the dual effects of its own elastic recovery and the tension of the tension spring 14, thereby achieving the function of supporting and positioning.

[0030] The electrode needle control device 2 includes an electrode needle 21, an electrode needle fixing block 22, an electrode needle connecting rod 23, a rack 24, a gear connecting rod 25, and a push rod 26. The electrode needle 21 is installed on the electrode needle fixing block 22 and is also installed inside the elastic bracket 12. The needle is inserted / retracted through the electrode needle guide hole 12-1 set on the elastic bracket 12. The push portion of the push rod 26 is installed on the handle cover. There is a guide hole on the rod portion of the push rod 26 that is guided and connected to the connecting rod portion of the gear connecting rod 25. The gear connecting rod 25 is fixed on the mounting column set on the handle cover 3. The gear connecting rod 25 can rotate around the center of the mounting column. The tooth portion of the gear connecting rod 25 is fan-shaped. The tooth portion of the gear connecting rod 25 forms a gear-rack connection with the tooth portion of the rack 24. One end of the electrode needle connecting rod 23 is fixedly connected to the rack 24, and the other end is fixed to the electrode needle fixing block 22.

[0031] The push part of the push rod 26 is pushed, and the rod part of the push rod 26 moves up and down, driving the gear connecting rod 25 to rotate around the center of the mounting column, thereby driving the gear connecting rod 25 and the rack 24 to produce relative movement. The forward and backward movement of the rack 24 drives the electrode needle connecting rod 23 to move forward and backward, and further drives the electrode needle fixing block 22 and the electrode needle 21 fixed thereon to move forward and backward, thereby realizing the process of taking out / retracting the electrode needle 21 through the electrode needle guide hole 12-1.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radiofrequency ablation catheter with a mechanical support system, comprising a handle cover, an electrode needle control device, and a mechanical support device, characterized in that: The mechanical support device and the electrode needle control device are installed in the handle cover, and the mechanical support system includes an inlet hose, an elastic bracket, a bracket fixing block, a flexible steel wire, and a stud connected in sequence; the mechanical support device also includes a tension spring, a bracket guide block, and an outer tube, the elastic bracket passes through the bracket guide block, the bracket guide block is fixedly connected to one end of the outer tube, the tension spring, the bracket fixing block, and the flexible steel wire pass through the outer tube, and the other end of the outer tube is connected to the handle cover, the tension spring is connected between the bracket guide block and the bracket fixing block, and the bracket fixing block can move in the outer tube; the mechanical support device also includes a limit pin and a nut seat, the nut seat is fixed in the handle cover, The stud is connected to the nut seat, and the stud includes a limiting boss and a pin assembly screw hole, and the limiting pin is installed in the pin assembly screw hole; the electrode needle control device includes an electrode needle connecting rod, an electrode needle, a rack, a gear connecting rod, and a push rod. There is an electrode needle guide hole on the elastic bracket, one end of the electrode needle is fixedly connected to the electrode needle fixing block, and the other end of the electrode needle is installed in the electrode needle guide hole. The push rod is guided and connected to the connecting rod part of the gear connecting rod, and the gear part of the gear connecting rod forms a gear-rack connection with the rack, and the gear connecting rod is installed in the handle cover, one end of the electrode needle connecting rod is fixedly connected to the rack, and the other end is fixedly connected to the electrode needle fixing block, and the flexible steel wire passes through the electrode needle fixing block.

2. The radiofrequency ablation catheter with a mechanical support system according to claim 1, characterized in that: The elastic bracket is made of elastic material and is arched in a natural state.

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